挿 means “insert”

さす · sasu

Also: put in, graft, wear (sword)

Kun'yomi (Japanese reading)
さす, はさむ
On'yomi (Chinese reading)
ソウ

JLPT N1 · Taught in secondary school · 10 strokes

The story

A hand (扌) easing one thing into another, like a stem into an ikebana vase: 挿す is to insert. 挿絵 are the pictures slipped between a book's pages, and 挿入 is the Insert in every Japanese software menu.

Used in 挿す (sasu, to insert/put in), 挿絵 (sashie, illustration), and 挿入 (sounyuu, insertion)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.